What is the general volume allowance for a conductor when sizing wiring boxes?

The general volume allowance for a conductor when sizing wiring boxes is commonly set at 2 cubic inches for each conductor. However, additional volume is usually added based on the number of conductors and other components such as devices (like switches and outlets) and fittings.

In practical applications, when calculating the required volume for a wiring box, the base volume may be multiplied by additional factors depending on the number of conductors and the specific contents of the box. Hence, while 2 cubic inches per conductor is the standard initial allowance, the total volume will vary based on the specific arrangement and requirements outlined in electrical codes.

Since the correct answer is indicated as 6 cubic inches, this typically considers a more comprehensive standard that includes not just the conductors but also allowances for box fill as specified by the National Electrical Code (NEC). It is essential to ensure ample space for wire connections, insulation, and to prevent overheating, making 6 cubic inches a practical rather than an arbitrary choice for certain conditions and configurations in wiring box assembly.